A former undercover police officer is suing Scotland Yard for failing to ‘protect’ him against falling in love with a woman in the group of eco-warriors he was sent to infiltrate.

In a landmark case due to be heard at the High Court next year, Mark Kennedy says his superiors at the Metropolitan Police knew he was sleeping with women he had been sent to spy on, but turned a blind eye because of the quality of intelligence he was providing.

In a writ filed last month, Kennedy, 43, is claiming damages of between £50,000 and £100,000 for ‘personal injury’ and ‘consequential loss and damage’ due to police ‘negligence’